
Super Mario Bros.: The Lost Levels, known in Japanese as Super Mario Bros. 2: For Super Players in the Japanese version of Super Mario All-Stars, is a direct sequel to the NES game Super Mario Bros. The game was initially released in 1986 for the Japan-only Family Computer Disk System. It uses a slightly altered version of Super Mario Bros.'s engine, with some new features, altered graphics and new enemy behavior, and different, significantly more challenging levels. Nintendo of America originally deemed this game too difficult and too much like the original to sell well in Western countries, so in order to prevent the early series being associated with frustration and staleness, it adapted Yume Kōjō: Doki Doki Panic and released it as Super Mario Bros.
